I. Lazaridis et. al. (2024) The Genetic Origin of the Indo-Europeans

The quest to uncover the origins of the Indo-European language family has intrigued scholars for centuries, drawing together linguists, historians, and geneticists in a collaborative effort. In recent years, genetic and linguistic studies have made significant advances in analyzing the migrations of ancient populations linked to the Indo-European languages. Among the latest contributions is the pre-print publication “The Genetic Origin of the Indo-Europeans” by Lazaridis and colleagues, representing a culmination of their research spanning over a decade.

One notable finding from this work is the identification of a genetic cluster termed the Caucasus Lower Volga (CLV) cline, a population inhabiting the region from the North Caucasus foothills to the Lower Volga. This genetic cluster appears to be the ancestor of the early Indo-European communities like the Bronze Age Anatolians and Yamnaya, an Early Bronze Age society (3300-2700 BC) that expanded across the Pontic-Caspian steppe in Eastern Europe, playing a significant role in spreading Indo-European languages throughout Europe and Asia.

However, unlike most Europeans, the Anatolian speakers did not acquire their language and genetics directly from the Yamnaya, but rather from the ancestral component of the CLV cline through Armenia, suggesting a strong possibility that the Indo-Anatolian languages originated in the Armenian Highlands.

It’s worth highlighting that Lazaridis et al. (2024) introduce a different terminology for the language family. They classify Indo-European as a subset of a broader macro family termed “Indo-Anatolian.”

“An alternative terminology, which we use here, names the entire linguistic group “Indo-Anatolian” (IA) and uses IE to refer to the set of related non-Anatolian languages.”

I. Lazaridis et. al. (2024) The Genetic Origin of the Indo-Europeans

Another significant revelation was the discovery of the deeper ancestry of the people from the CLV cline who trace about half of their genetics from Neolithic Armenia. The influx of genetic material from the South Caucasus into the Steppe occurred on multiple occasions, with the first wave associated with Palaeolithic Caucasian Hunter gatherer ancestry, and another with Armenia Neolithic ancestry from sites like Aknashen and Masis Blur.

“Eneolithic people of the North Caucasus-Lower Volga region had a mix of Caucasus Neolithic (Aknashen) and Lower Volga Eneolithic (Berezhnovka) ancestry. Migrations from [Armenia] to the Volga, Dnipro-Don and Caucasus-Anatolia regions spread one or both of these ancestries, admixing with Eastern hunter-gatherers (Lebyazhinka), with Dnipro-Don hunter-gatherers, and with Caucasus-Mesopotamian (Masis Blur, Çayönü) populations.”

I. Lazaridis et. al. (2024) The Genetic Origin of the Indo-Europeans

According to Lazaridis, the genetic lineage of the CLV migrated to Central Anatolia through an eastern route. Neolithic Armenians, connected to the Aknashen ancestry, journeyed to the North Caucasus around 6000 BC. There, they intermixed with locals of Northern descent, giving rise to the CLV cline. By around 4000 BC, these individuals began expanding both northward and southward. In the north, they contributed approximately 80% to the genetic makeup of the Yamnaya people, while in the south, they integrated with the local population in Armenia, as evidenced by genetic remnants found in sites like Areni I. Throughout the Bronze Age, these individuals further mingled with those from the Mesopotamia-Caucasus region, eventually migrating towards central Anatolia. This movement led to the establishment of prominent kingdoms, including those of the Hittites and Luwians.

These findings lend considerable weight to the idea that the origins of this influential language group can be traced back to the ancient landscapes of Armenia, reshaping our understanding of early human migrations and cultural interactions.

“A Caucasus-West Asian origin of Indo-Anatolian origins is strengthened by the finding of early migrations from the Caucasus into the Volga/Don-Dnipro Eneolithic populations followed by later Maikop/Armenian Neolithic ancestry into the ancestors of the Yamnaya. This hypothesis also maps to the transformation of Chalcolithic and Bronze Age central/western Anatolia which saw half to all its Neolithic population replaced.”

I. Lazaridis et. al. (2024) The Genetic Origin of the Indo-Europeans

If the origins of the Proto-Indo Anatolian language family are pushed further back in time, the probability of Armenia being the original homeland becomes even more plausible. Notably, a recent linguistic study by P. Heggarty et al. (2023) has meticulously dated the emergence of Indo-European languages to approximately 8000 years ago. This timeframe aligns seamlessly with the historical expansion of Armenian populations into the steppe region, providing additional support for the Armenian hypothesis regarding the formation of the CLV cline.

 

P. Heggarty et al. (2023) Language trees with sampled ancestors support a hybrid model for the origin of Indo-European languages

Heggarty et al. present a database of 109 modern and 52 time-calibrated historical Indo-European languages, which they analyzed with models of Bayesian phylogenetic inference. Their results suggest an emergence of Indo-European languages around 8000 years before present. This is a deeper root date than previously thought, and it fits with an initial origin south of the Caucasus followed by a branch northward into the Steppe region. These findings lead to a “hybrid hypothesis” that reconciles current linguistic and ancient DNA evidence from both the eastern Fertile Crescent (as a primary source) and the steppe (as a secondary homeland). 

P. Heggarty et al. (2023) Language trees with sampled ancestors support a hybrid model for the origin of Indo-European languages

Another recent linguistic study by Yang et. al. (2024) published in Nature magazine agrees with these results. The paper introduces a novel approach, language velocity field estimation, to uncover language dispersal trajectories and centers without relying on phylogenetic trees. By applying this method to agricultural language families, the study reveals that language dispersal aligns with population movement routes inferred from ancient DNA and archaeological evidence.

The conclusion favours the “Armenian Highlands” origin hypothesis of Indo-European languages rather than the alternative competing hypothesis of Pontic steppe region origin.

Yang et. al. (2024) Inferring language dispersal patterns with velocity field estimation

Our results show that the dispersal trajectories of these languages are primarily compatible with population movement routes inferred from ancient DNA and archaeological materials, and their dispersal centres are geographically proximate to ancient homelands of agricultural or Neolithic cultures. Our findings highlight that the agricultural languages dispersed alongside the demic diffusions and cultural spreads during the past 10,000 years. We expect that language velocity field estimation could aid the spatial analysis of language evolution and further branch out into the studies of demographic and cultural dynamics.

Yang et. al. (2024) Inferring language dispersal patterns with velocity field estimation

In conclusion, while the quest to uncover the origins of the Indo-European language family remains ongoing, the convergence of genetic and linguistic evidence increasingly points towards the Armenian Highlands as a crucial nexus in the early development and dispersal of these languages. As our understanding continues to evolve, bridging the gaps in data will be essential in painting a comprehensive picture of our prehistoric past.